High-quality pure phase ZSM-5 zeolite membranes are prepared through hydrothermal crystallization and secondary growth methods under situation of organo-template-free. The influences of the molar ratios of Na2 O/SiO_2 and Na F/SiO_2 on the preparation,structure,morphology and pervaporation performances of ZSM-5 zeolite membranes are investigated.The results show that ZSM-5 zeolite membranes prepared at lower molar ratio of Na2 O/SiO_2 or Na F/SiO_2 has a lower crystallinity in membrane layer,and mordenite c...